str2key.c

/* crypto/des/str2key.c *//* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * "This product includes cryptographic software written by * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */#include "des_locl.h"#include <openssl/crypto.h>void DES_string_to_key(constchar *str, DES_cblock *key)
{
DES_key_schedule ks;
int i,length;
registerunsignedchar j;
memset(key,0,8);
length=strlen(str);
#ifdef OLD_STR_TO_KEYfor (i=0; i<length; i++)
(*key)[i%8]^=(str[i]<<1);
#else /* MIT COMPATIBLE */for (i=0; i<length; i++)
{
j=str[i];
if ((i%16) < 8)
(*key)[i%8]^=(j<<1);
else
{
/* Reverse the bit order 05/05/92 eay */
j=((j<<4)&0xf0)|((j>>4)&0x0f);
j=((j<<2)&0xcc)|((j>>2)&0x33);
j=((j<<1)&0xaa)|((j>>1)&0x55);
(*key)[7-(i%8)]^=j;
}
}
#endif DES_set_odd_parity(key);
#ifdef EXPERIMENTAL_STR_TO_STRONG_KEYif(DES_is_weak_key(key))
(*key)[7] ^= 0xF0;
DES_set_key(key,&ks);
#else DES_set_key_unchecked(key,&ks);
#endif DES_cbc_cksum((constunsignedchar*)str,key,length,&ks,key);
OPENSSL_cleanse(&ks,sizeof(ks));
DES_set_odd_parity(key);
}
void DES_string_to_2keys(constchar *str, DES_cblock *key1, DES_cblock *key2)
{
DES_key_schedule ks;
int i,length;
registerunsignedchar j;
memset(key1,0,8);
memset(key2,0,8);
length=strlen(str);
#ifdef OLD_STR_TO_KEYif (length <= 8)
{
for (i=0; i<length; i++)
{
(*key2)[i]=(*key1)[i]=(str[i]<<1);
}
}
else
{
for (i=0; i<length; i++)
{
if ((i/8)&1)
(*key2)[i%8]^=(str[i]<<1);
else
(*key1)[i%8]^=(str[i]<<1);
}
}
#else /* MIT COMPATIBLE */for (i=0; i<length; i++)
{
j=str[i];
if ((i%32) < 16)
{
if ((i%16) < 8)
(*key1)[i%8]^=(j<<1);
else
(*key2)[i%8]^=(j<<1);
}
else
{
j=((j<<4)&0xf0)|((j>>4)&0x0f);
j=((j<<2)&0xcc)|((j>>2)&0x33);
j=((j<<1)&0xaa)|((j>>1)&0x55);
if ((i%16) < 8)
(*key1)[7-(i%8)]^=j;
else
(*key2)[7-(i%8)]^=j;
}
}
if (length <= 8) memcpy(key2,key1,8);
#endif DES_set_odd_parity(key1);
DES_set_odd_parity(key2);
#ifdef EXPERIMENTAL_STR_TO_STRONG_KEYif(DES_is_weak_key(key1))
(*key1)[7] ^= 0xF0;
DES_set_key(key1,&ks);
#else DES_set_key_unchecked(key1,&ks);
#endif DES_cbc_cksum((constunsignedchar*)str,key1,length,&ks,key1);
#ifdef EXPERIMENTAL_STR_TO_STRONG_KEYif(DES_is_weak_key(key2))
(*key2)[7] ^= 0xF0;
DES_set_key(key2,&ks);
#else DES_set_key_unchecked(key2,&ks);
#endif DES_cbc_cksum((constunsignedchar*)str,key2,length,&ks,key2);
OPENSSL_cleanse(&ks,sizeof(ks));
DES_set_odd_parity(key1);
DES_set_odd_parity(key2);
}